The mythical metal "mythril" found in many fantasy sources all traces back to the writings of J. R. R. Tolkien. Its completely mythical. http://en.wikipedia.org/wiki/Mithril Even wikipedia has gotten tired of listing them all.

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Hey, I'm not judging. I just like to shoot straight. I'm a man of science.

Besides those, zinc seems to have a slight blue hue. It is very little. Perhaps it has a small absorption band in blue.Most metals have a strong absorption band in the ultra-violet region and they just tend to reflect most of the visible spectrum.

That is either painted or is a plastic tip. The plastic tip can mean the ammo is expanding on impact. When painted it usually is used to denote either armour piercing, tracer, incendiary, APIT, etc. I know my tracers always have the tip painted orange. Those look like plastic tips, in 5.7x28 mm rounds and my trip to wiki confirms this: From left to right:

"SS195LF (lead free) The SS195LF is a commercially available cartridge that features a lead-free primer and produces ballistics similar to the SS192 round, which it replaced in late 2004.[43] It uses the same 1.8-g (28 grain) copper-jacketed aluminum core bullet as the SS192, and it can be identified by the unmarked, hollow void at the tip and the silver-colored primer.[19] The SS195 is classified by the ATF as not armor-piercing, and it is currently manufactured by FN Herstal in Belgium.[7][26] "

"SS196SR (sporting round)

The SS196SR was introduced in 2005 and it is now discontinued in favor of the SS197SR cartridge.[27] It featured a lead core 2.6-g (40 grain) Hornady V-Max bullet which it propelled at a muzzle velocity of roughly 500 m/s (1,650 ft/s) when fired from the Five-seven.[27] The polycarbonate tip used in the V-Max bullet acts as a wedge, enhancing expansion of the bullet. The SS196 was classified by the ATF as not armor-piercing, and in testing by FNH USA it did not penetrate a Level II vest when fired from the Five-seven.[26] The SS196 can be identified by its red polymer tip.[43]

SS197SR (sporting round)

The SS197SR is currently offered to civilian shooters in addition to the SS195LF.[45] It uses the same lead core 2.6-g (40 grain) Hornady V-Max projectile as the SS196SR,[7] but it is loaded for a muzzle velocity roughly 30-m/s (100 ft/s) higher. The projectile has a blue-colored polymer tip instead of the red color used in the SS196 projectile tip.[19] The SS197 is currently manufactured by Fiocchi under contract for FN Herstal[7][46][47] and it is distributed in the United States by Federal Cartridge Company.[19][45] "